<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>
    <el-card>
      <!-- 头部警告区域 -->
      <el-alert
        title="注意: 只允许为第三级分类设置相关参数!"
        :closable="false"
        type="warning"
        show-icon
      >
      </el-alert>
      <!-- 选择商品分类 -->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类: </span>
          <!-- 选择商品分类的级联选择框 -->
          <el-cascader
            v-model="selectdCateKeys"
            :options="cataList"
            :props="{ expandTrigger: 'hover', ...cateProps }"
            @change="handleChange"
          ></el-cascader>
        </el-col>
      </el-row>
      <!-- tab 页签区 -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!-- 添加动态参数的面板 -->
        <el-tab-pane label="动态参数" name="many">
          <el-button
            type="primary"
            @click="addDialogVisible = true"
            size="mini"
            :disabled="isBtnDisabled"
            >添加参数</el-button
          >
          <!-- 动态参数表格 -->
          <el-table :data="manyTableData" border stripe>
            <!-- 展开列 -->
            <el-table-column type="expand">
              <template v-slot="scope">
                <!-- 循环渲染Tag标签 -->
                <el-tag
                  closable
                  v-for="(item, index) in scope.row.attr_vals"
                  :key="index"
                  @close="handleClosed(index, scope.row)"
                >
                  {{ item }}</el-tag
                >
                <!-- 输入的文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <!-- 添加按钮 -->
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                  >+ New Tag</el-button
                >
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index" label="#"> </el-table-column>
            <el-table-column label="参数名称" prop="attr_name">
            </el-table-column>
            <el-table-column label="操作">
              <template v-slot="scope">
                <el-button
                  type="primary"
                  @click="showEditDialog(scope.row.attr_id)"
                  icon="el-icon-edit"
                  size="mini"
                  >编辑</el-button
                >
                <el-button
                  type="danger"
                  @click="removeParams(scope.row.attr_id)"
                  icon="el-icon-delete"
                  size="mini"
                  >删除</el-button
                >
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!-- 添加静态属性的面板 -->
        <el-tab-pane label="静态属性" name="only">
          <el-button
            type="primary"
            @click="addDialogVisible = true"
            size="mini"
            :disabled="isBtnDisabled"
            >添加属性</el-button
          >
          <!-- 静态参数表格 -->
          <el-table :data="onlyTableData" border stripe>
            <!-- 展开列 -->
            <el-table-column type="expand">
              <template v-slot="scope">
                <!-- 循环渲染Tag标签 -->
                <el-tag
                  closable
                  v-for="(item, index) in scope.row.attr_vals"
                  :key="index"
                  @close="handleClosed(index, scope.row)"
                >
                  {{ item }}</el-tag
                >
                <!-- 输入的文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                  >+ New Tag</el-button
                >
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index" label="#"> </el-table-column>
            <el-table-column label="属性名称" prop="attr_name">
            </el-table-column>
            <el-table-column label="操作">
              <template v-slot="scope">
                <el-button
                  type="primary"
                  @click="showEditDialog(scope.row.attr_id)"
                  icon="el-icon-edit"
                  size="mini"
                  >编辑</el-button
                >
                <el-button
                  type="danger"
                  @click="removeParams(scope.row.attr_id)"
                  icon="el-icon-delete"
                  size="mini"
                  >删除</el-button
                >
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>
    <!-- 添加参数的对话框 -->
    <el-dialog
      :title="'添加' + titleText"
      :visible.sync="addDialogVisible"
      width="50%"
      @close="addDialogClosed"
    >
      <el-form
        :model="addForm"
        :rules="addFormRules"
        ref="addFormRef"
        label-width="100px"
      >
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>
    <!-- 修改参数对话框 -->
    <el-dialog
      :title="'修改' + titleText"
      :visible.sync="editDialogVisible"
      width="50%"
      @close="editDialogClosed"
    >
      <el-form
        :model="editForm"
        :rules="editFormRules"
        ref="editFormRef"
        label-width="100px"
      >
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      // 商品分类列表
      cataList: [],
      // 级联选择框的配置对象
      cateProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children',
      },
      // 级联选择框双向绑定的数组
      selectdCateKeys: [],
      // 被激活的页签的名称
      activeName: 'many',
      // 动态参数数据
      manyTableData: [],
      // 静态属性数据
      onlyTableData: [],
      // 控制添加对话框的显示与隐藏
      addDialogVisible: false,
      // 添加参数的表单数据对象
      addForm: {
        attr_name: '',
      },
      // 添加表单的验证规则
      addFormRules: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur' },
        ],
      },
      // 控制修改对话框的显示与隐藏
      editDialogVisible: false,
      // 修改的表单数据对象
      editForm: {},
      // 修改表单的验证规则
      editFormRules: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur' },
        ],
      },
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    // 获取所有商品分类的数据
    async getCateList() {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类失败!')
      }
      this.cataList = res.data
      console.log(this.cataList)
    },
    // 级联选择框选中项变化,会触发这个函数
    handleChange() {
      this.getParamsData()
    },
    // tab 页签点击事件的处理函数
    handleTabClick() {
      this.getParamsData()
    },
    // 获取参数的列表数据
    async getParamsData() {
      // 证明选中的不是三级分类
      if (this.selectdCateKeys.length !== 3) {
        this.selectdCateKeys = []
        this.manyTableData = []
        this.onlyTableData = []
        return
      }
      // 证明选中的是三级分类
      // 根据所选的分类的ID,和当前所处的面板,获取对应的参数
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes`,
        {
          params: { sel: this.activeName },
        }
      )
      if (res.meta.status !== 200) {
        return this.$message.error('获取参数列表失败!')
      }
      // 获取Tag的数据分割为数组
      res.data.forEach((item) => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
        // 控制文本框的显示和隐藏
        item.inputVisible = false
        // 文本框中输入的值
        item.inputValue = ''
      })
      if (this.activeName === 'many') {
        this.manyTableData = res.data
      } else {
        this.onlyTableData = res.data
      }
    },
    // 监听对话框的关闭事件
    addDialogClosed() {
      this.$refs.addFormRef.resetFields()
    },
    // 点击按钮,添加参数
    addParams() {
      this.$refs.addFormRef.validate(async (valid) => {
        if (!valid) return
        const { data: res } = await this.$http.post(
          `categories/${this.cateId}/attributes`,
          {
            attr_name: this.addForm.attr_name,
            attr_sel: this.activeName,
          }
        )
        if (res.meta.status !== 201) {
          return this.$message.error('添加参数失败!')
        }
        this.$message.success('添加参数成功!')
        this.addDialogVisible = false
        this.getParamsData()
      })
    },
    // 点击按钮展示修改的对话框
    async showEditDialog(id) {
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes/${id}`,
        {
          params: { attr_sel: this.activeName },
        }
      )
      console.log(res)
      if (res.meta.status !== 200) {
        return this.$message.error('获取参数信息失败!')
      }
      this.editForm = res.data
      this.editDialogVisible = true
    },
    // 重置修改的表单
    editDialogClosed() {
      this.$refs.editFormRef.resetFields()
    },
    // 点击按钮修改数据信息
    editParams() {
      this.$refs.editFormRef.validate(async (valid) => {
        if (!valid) return
        const { data: res } = await this.$http.put(
          `categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
          {
            attr_name: this.editForm.attr_name,
            attr_sel: this.activeName,
          }
        )

        if (res.meta.status !== 200) {
          return this.$message.error('修改参数失败!')
        }
        this.$message.success('修改参数成功!')
        this.getParamsData()
        this.editDialogVisible = false
      })
    },
    // 根据id删除对应的参数项
    async removeParams(id) {
      const confirmResult = await this.$confirm(
        '此操作将永久删除该分类, 是否继续?',
        '删除',
        {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning',
        }
      ).catch((err) => err)

      if (confirmResult !== 'confirm') {
        return this.$message.info('已取消删除操作!')
      }
      const { data: res } = await this.$http.delete(
        `categories/${this.cateId}/attributes/${id}`
      )
      if (res.meta.status !== 200) {
        return this.$message.error('删除参数失败!')
      }
      this.$message.success('删除参数成功')
      this.getParamsData()
    },
    // 文本框失去焦点和回车触发
    handleInputConfirm(row) {
      // 去除输入框的空格
      if (row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
        return
      }
      // 如果没有return证明内容合法做后续处理
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false
      // 需要发送请求,保存
      this.saveAttrVals(row)
    },
    // Tag标签的删除
    handleClosed(index, row) {
      row.attr_vals.splice(index, 1)
      this.saveAttrVals(row)
    },
    // 将对attr_vals的操作,保存到数据库
    async saveAttrVals(row) {
      const { data: res } = await this.$http.put(
        `categories/${this.cateId}/attributes/${row.attr_id}`,
        {
          attr_sel: this.activeName,
          attr_name: row.attr_name,
          attr_vals: row.attr_vals.join(' '),
        }
      )
      if (res.meta.status !== 200) {
        return this.$message.error('修改参数项失败!')
      }
      this.$message.success('修改参数项成功!')
    },
    // 点击按钮显示文本输入框
    showInput(row) {
      row.inputVisible = true
      // 自动获取焦点
      // $nextTick 方法作用: 当页面上的元素被重新渲染之后,才会指定回调函数中的代码
      this.$nextTick((_) => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
  },
  computed: {
    // 如果按钮需要被禁用.则返回true,否则返回fasle
    isBtnDisabled() {
      if (this.selectdCateKeys.length !== 3) {
        return true
      } else {
        return false
      }
    },
    cateId() {
      if (this.selectdCateKeys.length === 3) {
        return this.selectdCateKeys[2]
      }
      return null
    },
    // 动态计算标题的文本
    titleText() {
      if (this.activeName === 'many') {
        return '动态参数'
      } else {
        return '静态属性'
      }
    },
  },
}
</script>

<style lang="less" scoped>
.cat_opt {
  margin: 15px 0;
}
.el-tag {
  margin: 5px 10px;
}
.button-new-tag {
  margin: 5px 10px;
  height: 32px;
  line-height: 30px;
  padding-top: 0;
  padding-bottom: 0;
}
.input-new-tag {
  width: 90px;
  margin: 5px 10px;
  vertical-align: bottom;
}
</style>
